feat[dashboard]: show current ASN in dashboard statistics

src-ui/src/app/components/dashboard/widgets/statistics-widget/statistics-widget.component.html

@@ -15,6 +15,12 @@
         <ng-container i18n>Total characters</ng-container>:
         <span class="badge bg-secondary text-light rounded-pill">{{statistics?.character_count | number}}</span>
       </div>
+      @if (statistics?.current_asn) {
+        <div class="list-group-item d-flex justify-content-between align-items-center" routerLink="/documents/">
+          <ng-container i18n>Current ASN</ng-container>:
+          <span class="badge bg-secondary text-light rounded-pill">{{statistics?.current_asn | number}}</span>
+        </div>
+      }
       @if (statistics?.document_file_type_counts?.length > 1) {
         <div class="list-group-item filetypes">
           <div class="d-flex justify-content-between align-items-center my-2">

src-ui/src/app/components/dashboard/widgets/statistics-widget/statistics-widget.component.spec.ts

@@ -189,4 +189,38 @@ describe('StatisticsWidgetComponent', () => {
       'Other(0.9%)'
     )
   })
+
+  it('should display the current ASN', () => {
+    const mockStats = {
+      current_asn: 122,
+    }
+
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}statistics/`
+    )
+
+    req.flush(mockStats)
+    fixture.detectChanges()
+
+    expect(fixture.nativeElement.textContent.replace(/\s/g, '')).toContain(
+      'CurrentASN:122'
+    )
+  })
+
+  it('should not display the current ASN if it is not available', () => {
+    const mockStats = {
+      current_asn: 0,
+    }
+
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}statistics/`
+    )
+
+    req.flush(mockStats)
+    fixture.detectChanges()
+
+    expect(fixture.nativeElement.textContent.replace(/\s/g, '')).not.toContain(
+      'CurrentASN:'
+    )
+  })
 })

src-ui/src/app/components/dashboard/widgets/statistics-widget/statistics-widget.component.ts

@@ -18,6 +18,7 @@ export interface Statistics {
   correspondent_count?: number
   document_type_count?: number
   storage_path_count?: number
+  current_asn?: number
 }
 
 interface DocumentFileType {

src/documents/views.py

@@ -1414,6 +1414,12 @@ class StatisticsView(APIView):
             .get("characters__sum")
         )
 
+        current_asn = Document.objects.aggregate(
+            Max("archive_serial_number", default=0),
+        ).get(
+            "archive_serial_number__max",
+        )
+
         return Response(
             {
                 "documents_total": documents_total,
@@ -1425,6 +1431,7 @@ class StatisticsView(APIView):
                 "correspondent_count": correspondent_count,
                 "document_type_count": document_type_count,
                 "storage_path_count": storage_path_count,
+                "current_asn": current_asn,
             },
         )